2 - Fagor Automation

Selection criteria
5.
SELECTING CRITERIA
Power supply selection
232
DDS
HARDWARE
Ref.1307
218
5.4 Power supply selection
Calculation of the power required from the power supply by the synchronous servo motors
Initially, considering the mechanical power provided by the motors:
T. H5/5 Power supply selection depending on the mechanical power output of the motor.
SYNCHRONOUS FXM & FKM
Power (characteristics table)
GROUP I
0 to 2 kW
Synchronous
GROUP II
0 to 8.5 kW
Synchronous
GROUP III
8.5 to 27 kW
Synchronous
Synchronous
motors per group
Axes Pcal n nN Pa
1
2
3
1
n : Max. axis speed in the application (rpm)
nN: Motor rated speed (rpm)
Pa= Pcal·1.17· [n/nN] : Axis power (kW)
kW rpm rpm kW
Sum of GROUP I: * Ki
2 +
3
1
Sum of GROUP II: * Kii
2 +
3
Sum of GROUP III: * Kiii
K factor
1 1
2 0.63
3 0.50
4 0.38
5 0.33
6 0.28
... where:
=
SUM OF POWER: (kW) 1
Pcal: motor power (kW) according to the motor
characteristics table.
1.17: coefficient that stores the efficiency of the
motor (0.9) and that of the drive (0.95).
The servo set is divided in groups depending on
their power by applying to each one a simultaneity
factor Ki, Kii, Kiii.